Enhanced capacitive performance of a Ag-functionalized low crystalline Co3O4/graphene composite

In this paper, a Ag–Co3O4/graphene aerogel (GA) composite was prepared by dispersing Ag-modified low crystalline Co3O4 nanowires onto a GA carrier. The capacitive performance of the Ag–Co3O4/GA was studied and the results were compared with those of Co3O4/GA. Ag-functionalized Co3O4/graphene with precursor n(Ag)/n(Co) = 0.51 exhibited the highest specific capacitance (Cs) value of 1180 F g−1 at a current density of 1 A g−1, and the capacity retention was 86% after 1000 cycles at 5 A g−1. Furthermore, the electrochemical impedance spectroscopic results revealed a certain effect of electrolyte ions on the supercapacitive behavior. Ag-functionalized Co3O4/GA is believed to be one of the potential materials for supercapacitors with high performance.